System of electrical regulation.



No. 816,442. PATENTED MAR. 27, 1906. W. L. R.EMMET.

SYSTEM OF ELECTRICAL REGULATION APPLICATION FILED JULY 1, 1904.

WILLIAM L. n. rim-mar, or

UNITED STATES. PATENT orluon...

NEW YORK, ASSIGNOR To GENERAL ELECTRIC COMPANY, A CORPORATION OF NEWYORK SYSTEM OF ELECTRICAL REGULATION.

particularly in plants where ""b'ines areinstalled, itis de-v arg'eexciter units which the turbines, and theflike. Unircumstances it 'is.not desirable to re'Fulate-theturbinedriven generators by 'regu atiilg'the "voltage; of the exciter, since the changes in voltage re citernugh-t-objectionably a .paratu's-sup lied by the exciter. To overcomethese ifficulties and at thesame time to permit the use of a singleexciting'source, I interpyea booster between the exciting source a d thegenerator to be regulated and i 'vary'the voltageof this booster bymeans of v a "suit" le regulator, so as to obtain the deoltage orcurrent at the generator.

uired of the exte The r' gulator whichlemplo for controlling thebosteris that common y known in the the Tirrill. regulator, described in UniedStates Patent No. 726,234, though 'tionsthereof may be employed, if de-S11 0 5 I he novel features which characterize my in ention are pointedout with particularityinv the appended claims. The inventionitself,however, will be better understood by refer enceto the followingdescription, taken'in connection with the accompanying drawing,

" which represents diagrammatically one embodiment of my invention.Referring to the drawing, 1 indicates a Y sourcefof exciting-current forsupplying any desired number of translating devices at the :station.This source may be a sinl'e large exciter or it may be any other suitabe source of direct current-sue for example, as the ordinaryelectric-light-supply mains. 5'0 The exciting source 1 may supplyexcitingcurrent to a number of generators. B way of example I haverepresented two suc generators M2 and 3. These are of the well- ,knownturbine-driven type in which the al- Specificatibn. of Letters Patent.

. Application filed July 1, 1904. Serial No. 214,878.

new, and

mg '-'current for the wholewill also operate certain. as the oil-pumps,electrical ect the other apthe now well-known Tirrill regulator.

the core 20, connected Patented March 27,1906. i

ternatingcurrent generator is coupled 'di-' rectly to the rotary memberofthe turbine and the wholemounted soasto'formla univtary structure.

so as to have ordinarily a constant-voltage, I

provide for'regulatin -the voltage or current sup liedto t e fielf ofthe macliinef2 by ma 'ng use of a boosting set consisting of a enerator-9 in series, for example,with the eads 7, which generator ismechanically driven byan electric motor 10, receiving its power from theexciter bus-bars or mains 11 and 12. It is to be understood that where Iuse the term booster I implythat'the volta e of the so-called boostermaybe utilized I either to assist or to cut down the voltage of theexciting source, as thecase may be. In 5 other Words, there may beeither a positive or a negative boosting action. 'Q 3 v To control thebooster in response to the requirements ofthe generator 2, I make use ofa smtable-regulator fsuch, for example, as I Such I a. regulator I haveindicated somewhat dia grammatically-in thed'ri'awing;i'lhe portions ofthe regulator responsive to voltage colisist of two floatin contactsIS'andMQeach carried by pivote lever-arms 15mm 16, respectively. Eachlever-arm is controlledb a solenoid and core. The solenoid l7,w'hicoperates upon the core 18, connectedwith;

the lever 15, receives the voltage at the ter 99 minals of the fieldexciting-circu t. of, the ma chine 2. The solenoid 19, whichacts u on'fto thelleyer-arm le I ei s y means of a small transformer 21, a voltageproportionalto thatldeveloped on the alternating-current side of thegenera tor2. The contacts 13 and 14 when they cometogether or separateserve -to controladiifrenj-Q tiall -wound relay-magnet 22. This mag-inet as two windings 23 and 2 4 of which the winding 23 is connectedacross'some. source of current, such as the bus-bars 11 and 12, whilethe other winding 24 is adapted tohave its circuit'closed by thecontacts 13 and'l4 across the same source. Thus when the. contacts Band14 are closed the two windings neutralize each other, while when theconto produce an excessive change of voltage.

The contacts therefore keep up a rapid open-.

ingand closing, so that the resistance, being in circuit only part ofthe time, produces as a net effect the desired regulation. Thus if thevoltage on the alternating-current mains of the generator rises solenoid19 causes the contacts 14 to be brought into temporarily-longerengagement with the contact 13. This causes the magnet 22 to bedenergized, and thereby opens a shunt-circuit about the resistance 27and includes the latter in circuit with the field of the booster 9. Thebooster'voltage, which in this case is supposedto be added to that ofthe exciter source, is then reduced. This reduction of voltage isimmediately'felt by the controlling-solenoid 18, whereupon the contact13, controlled thereby, recedes from the lower contact 14, thus openingthe circuit of the magnet 22, which had just been closed. This openingof the circuit in response to the field exciting voltage takes lace morepromptly than would be the case if the apparatus were constructed so asto open the contacts only after the alternating voltage of the machinehad been reduced and the weakening effect thereof transmitted to thesolenoid 19. This promptness of action of the re 'lator prevents thesurging or hunting of t e voltage of the 'machine which would otherwisetake place. The voltage having been thus adjusted, the contacts continueto vibrate regularly until some change of voltage occurs requiringcorrection, whereu on' an'action takes place similar to that a readydescribed. J

The generator 3 (represented at the righthand side of the drawing) isshown as having a separate consumption-circuit, as may be desirable inmany instances. In this case it requires a system of regulation separatefrom that of the generator 2, and such a system, the same inconstruction as that used in connection with the regulator. 2, isindicated in 1 Since the elements of this the drawing.

those in regulating system are the same as above normal themembers, oneof the system ust described, no necessity exists for a descriptionthereof in detail. It will be evident, however, that by the use of asystem of regulation of its own the generator 3 may be controlledindependently of the generator 2. It is furthermore evident that the twogenerators may, as indicated, receive their exciting current from thesame exciting source 1 and yet be independently regulable; If it isdesired, however, to run the generators 2 and 3 in multiple, then oneregulating system only is required and the other may be omitted.

It is evident from tion that various modifications in the embodiments ofmy invention maybe made without departing from the spirit thereof, forwhich reason I do not wish to be limited to the exact details shown anddescribed.

I What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. The combination of an alternating-cur rent generator havingalternating current mains leading therefrom, and having a direct-currentexciting-circuit connected thereto, a source of exciting-currentconnected to said exciting-circuit, a booster interposed in theexciting-circuit, and a regulator for said booster responsive both tothe voltage of the alternating-current mains and to the resultantvoltage of said exciting-source and booster.

2. The combination of a pluralityof alternating-current generators, acommon source of exciting-current, and a booster or regulating source ofvoltage interposed between said source and each of said generators.

3. The combination of a dynamo-electric machine having two relativelyrotatable which is connected to an alternating-circuit and the other toa directcurrent circuit, a voltage-generating device in circuit withsaid direct-current circuit, and

a winding on said device responsive both to the voltage of thealternating-current mains and to the resultant voltage of said directcurrent circuit.

4. The combination of a plurality of alternating-current dynamo-electricmachines. a

. common source of exciting-current, and a regulating sourceof voltageinterposed between the source of exciting-current and one or more ofsaid machines.

In witness whereof I have hereunto set my hand this 29th day of J une,1904.

WILLLDI L. R. EMMET.

\Vitnesses Bnxainux B. llLLL llnrnx URFURD IOU

